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AM3358: U-boot defconfig migration from 2017.01 to 2021.01

Part Number: AM3358

Hello,

I have custom board based on AM335x, currently on U-boot 2017.01. I am in process of migrating it to 2021.01 version of U-boot and seeking help in creating defconfig files. 

Custom board has 3 different defconfigs present under confifgs/ folder. Is there any way I can convert those defconfig file from one version of u-boot to another version? Similarly what we do with Linux kernel through some commands like "make olddefconfig".

These defconfigs were created with taking reference of "am335x_boneblack_defconfig" and "am335x_evm_defconfig" for 2017.01 U-boot. Should that process be done again for 2021.01 version of U-boot?

Regards,

Raxesh